I hate lava and dont want it in my game, is there a way to remove it for me in my game only, for example by modifying terrain.txt and replacing the lava entry with passable rubble data or something ? There is this warning sign heading the file that threatens crash and save file incompatibility when incompetent people (which I am) try to mess with it, so if anyone knowledgable could tell me what to do I would be grateful.

name:lava
graphics:::u
priority:13
flags:ROCK | PASSABLE
info:0:1
desc:Ends LOS, stops missiles, bolts, and beams, and reduces the radius of ball
desc:spells. May dissolve or be tunnelled to normal floor, and can be walked
desc:through by the player and monsters.

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One for the Dark Lord on his dark throne
In the Land of Mordor where the Shadows lie.